from unittest import TestCase

import numpy as np

from pyecsca.sca import Trace, match_pattern, match_part, pad
from .utils import plot


class MatchingTests(TestCase):

    def test_simple_match(self):
        pattern = Trace(None, None,
                        np.array([1, 15, 12, -10, 0, 13, 17, -1, 0], dtype=np.dtype("i1")))
        base = Trace(None, None, np.array(
                [0, 1, 3, 1, 2, -2, -3, 1, 15, 12, -10, 0, 13, 17, -1, 0, 3, 1],
                dtype=np.dtype("i1")))
        filtered = match_part(base, 7, 9)
        self.assertListEqual(filtered, [7])
        plot(self, base=base, pattern=pad(pattern, (filtered[0], 0)))

    def test_multiple_match(self):
        pattern = Trace(None, None,
                        np.array([1, 15, 12, -10, 0, 13, 17, -1, 0], dtype=np.dtype("i1")))
        base = Trace(None, None, np.array(
                [0, 1, 3, 1, 2, -2, -3, 1, 18, 10, -5, 0, 13, 17, -1, 0, 3, 1, 2, 5, 13, 8, -8, 1, 11, 15, 0, 1, 5, 2, 4],
                dtype=np.dtype("i1")))
        filtered = match_pattern(base, pattern, 0.9)
        self.assertListEqual(filtered, [7, 19])
        plot(self, base=base, pattern1=pad(pattern, (filtered[0], 0)), pattern2=pad(pattern, (filtered[1], 0)))